package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
@Slf4j
public class ReportServiceImpl implements ReportService {
    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WorkspaceService workspaceService;

    /**
     * 根据起止日期查询营业额统计
     *
     * @param begin
     * @param end
     * @return
     */
    @Override
    public TurnoverReportVO turnoverStatistics(LocalDate begin, LocalDate end) {
        //先根据起始日期计算中间日期列表
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)) {
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
//        log.info("dateList:{}", dateList);
        //把dateList转成字符串，用逗号分隔
        String date = StringUtils.join(dateList, ",");
//        log.info("date:{}", date);
        //根据日期列表获取营业额，计算当天已完成订单的总营业额
        // select sum(amount) from orders where order_time > 00:00:00 and order_time < 23:59:59 and status = 5;
        List<Double> turnoverList = new ArrayList<>();
        for (LocalDate localDate : dateList) {
            //先构造出每天的开始时间和结束时间
            LocalDateTime beginTime = LocalDateTime.of(localDate, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(localDate, LocalTime.MAX);
            //查询当天已完成订单的总营业额
            Map map = new HashMap<>();
            map.put("beginTime", beginTime);
            map.put("endTime", endTime);
            map.put("status", Orders.COMPLETED);
            Double amountSum = orderMapper.getAmountSum(map);
            if (amountSum == null) {
                amountSum = 0.0;
            }
            //把每个日期的营业额加入amountList
            turnoverList.add(amountSum);
        }
        //把amountList转成字符串，用逗号分隔
        String turnover = StringUtils.join(turnoverList, ",");
        return TurnoverReportVO
                .builder()
                .turnoverList(turnover)
                .dateList(date)
                .build();
    }

    /**
     * 根据起止日期查询用户统计
     *
     * @param begin
     * @param end
     * @return
     */
    @Override
    public UserReportVO userStatistics(LocalDate begin, LocalDate end) {
        //先根据起始日期计算中间日期列表
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.isEqual(end)) {
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        //存放每日新增用户数
        List<Integer> newUserList = new ArrayList<>();
        //存放每日总用户数
        List<Integer> totalUserList = new ArrayList<>();

        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Map map = new HashMap<>();
            map.put("endTime", endTime);
            Integer totalUser = userMapper.getCountByMap(map);
            totalUserList.add(totalUser);
            map.put("beginTime", beginTime);
            Integer newUser = userMapper.getCountByMap(map);
            newUserList.add(newUser);
        }
        //把dateList,totalUserList,newUserList转成字符串，用逗号分隔
        String date = StringUtils.join(dateList, ",");
        String totalUser = StringUtils.join(totalUserList, ",");
        String newUser = StringUtils.join(newUserList, ",");

        return UserReportVO.builder()
                .dateList(date)
                .newUserList(newUser)
                .totalUserList(totalUser)
                .build();
    }

    /**
     * 根据起止日期查询订单统计
     *
     * @param begin
     * @param end
     * @return
     */
    @Override
    public OrderReportVO orderStatistics(LocalDate begin, LocalDate end) {
        //先根据起始日期计算中间日期列表
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.isEqual(end)) {
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        //存放每日总订单数
        List<Integer> totalOrderCountList = new ArrayList<>();
        //存放每日有效订单数
        List<Integer> validOrderCountList = new ArrayList<>();
        for (LocalDate date : dateList) {
            //构造出每天的开始时间和结束时间
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            //查询当天总订单数
            Map map = new HashMap<>();
            map.put("begin", beginTime);
            map.put("end", endTime);
            Integer orderCount = orderMapper.getOrderCountByMap(map);
            totalOrderCountList.add(orderCount);
            //查询当天有效订单数
            map.put("status", Orders.COMPLETED);
            Integer validOrderCount = orderMapper.getOrderCountByMap(map);
            validOrderCountList.add(validOrderCount);
        }
        Integer totalOrderCount = totalOrderCountList.stream().reduce(Integer::sum).get();
        Integer totalValidCount = validOrderCountList.stream().reduce(Integer::sum).get();
        Double orderCompletionRate = 0.0;
        if (totalOrderCount != 0) {
            orderCompletionRate = totalValidCount.doubleValue() / totalOrderCount;
        }
        String date = StringUtils.join(dateList, ",");
        String totalOrder = StringUtils.join(totalOrderCountList, ",");
        String validOrder = StringUtils.join(validOrderCountList, ",");


        return OrderReportVO.builder()
                .dateList(date)
                .validOrderCountList(validOrder)
                .orderCountList(totalOrder)
                .totalOrderCount(totalOrderCount)
                .validOrderCount(totalValidCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }

    /**
     * 统计销量前10的商品
     *
     * @param begin
     * @param end
     * @return
     */
    @Override
    public SalesTop10ReportVO salesTop10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);
        List<GoodsSalesDTO> goodsSalesDTOList = orderMapper.getSaleTop10(beginTime, endTime);
        List<String> names = goodsSalesDTOList.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        List<Integer> numbers = goodsSalesDTOList.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        String nameList = StringUtils.join(names, ",");
        String numberList = StringUtils.join(numbers, ",");

        return SalesTop10ReportVO.builder()
                .nameList(nameList)
                .numberList(numberList)
                .build();
    }

    /**
     * 导出运营数据报表
     *
     * @param response
     */
    public void exportBusinessData(HttpServletResponse response) {
        //1. 查询数据库，获取营业数据---查询最近30天的运营数据
        LocalDate dateBegin = LocalDate.now().minusDays(30);
        LocalDate dateEnd = LocalDate.now().minusDays(1);

        //查询概览数据
        BusinessDataVO businessDataVO = workspaceService.getBusinessData(LocalDateTime.of(dateBegin, LocalTime.MIN), LocalDateTime.of(dateEnd, LocalTime.MAX));

        //2. 通过POI将数据写入到Excel文件中
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");

        try {
            //基于模板文件创建一个新的Excel文件
            XSSFWorkbook excel = new XSSFWorkbook(in);

            //获取表格文件的Sheet页
            XSSFSheet sheet = excel.getSheet("Sheet1");

            //填充数据--时间
            sheet.getRow(1).getCell(1).setCellValue("时间：" + dateBegin + "至" + dateEnd);

            //获得第4行
            XSSFRow row = sheet.getRow(3);
            row.getCell(2).setCellValue(businessDataVO.getTurnover());
            row.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessDataVO.getNewUsers());

            //获得第5行
            row = sheet.getRow(4);
            row.getCell(2).setCellValue(businessDataVO.getValidOrderCount());
            row.getCell(4).setCellValue(businessDataVO.getUnitPrice());

            //填充明细数据
            for (int i = 0; i < 30; i++) {
                LocalDate date = dateBegin.plusDays(i);
                //查询某一天的营业数据
                BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));

                //获得某一行
                row = sheet.getRow(7 + i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessData.getTurnover());
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                row.getCell(6).setCellValue(businessData.getNewUsers());
            }

            //3. 通过输出流将Excel文件下载到客户端浏览器
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);

            //关闭资源
            out.close();
            excel.close();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }


}
